What is the Least Common Multiple of 555 and 561?

Least common multiple or lowest common denominator (lcd) can be calculated in two way; with the LCM formula calculation of greatest common factor (GCF), or multiplying the prime factors with the highest exponent factor.

Least Common Multiple of 555 and 561 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 555 and 561, than apply into the LCM equation.

GCF(555,561) = 3
LCM(555,561) = ( 555 × 561) / 3
LCM(555,561) = 311355 / 3
LCM(555,561) = 103785

Least Common Multiple (LCM) of 555 and 561 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 555 and 561. First we will calculate the prime factors of 555 and 561.

Prime Factorization of 555

Prime Factorization of 561

Now multiplying the highest exponent prime factors to calculate the LCM of 555 and 561.

LCM(555,561) = 3¹ × 5¹ × 37¹ × 11¹ × 17¹
LCM(555,561) = 103785